The planet Kataan suffers a protracted drought due to increasing solar radiation. Realizing that their sun was about to go nova, the inhabitants launch a probe containing a memory record of their civilization. (TNG: "The Inner Light")

A group of humanoid travelers are stranded on the planet Meridian, which intersects two distinct dimensions. (DS9: "Meridian")

Qo'noS is attacked by a group of plundering aliens, whom the Klingons name the Hur'q. Many cultural artifacts are stolen, most notably the Sword of Kahless. (DS9: "The Sword of Kahless") Also during this period, Klingon warriors set out and slay all of their gods, because they are more trouble than they are worth. (DS9: "Homefront")

The ruling family of the Ramatis system are discovered to lack the gene required for the sense of hearing. A system is developed in which the members of the ruling family may both hear and speak through a "chorus" of interpreters. (TNG: "Loud As A Whisper")

The people of Mintaka III begin to experience a transformation in their society as they move away from their belief in the Overseer towards a new understanding of their world based on logic and rational thinking. (TNG: "Who Watches The Watchers")

Gomtuu, a living spaceship, contacts one of its own kind, a contact that will be the last for many centuries. (TNG: "Tin Man")

Lines from "Rightful Heir" and DS9: "Looking for par'Mach in All the Wrong Places" indicate that the time of Kahless was "a thousand years ago", i.e., apparently implying the 14th century. However, "Rightful Heir" mentions the monks on Boreth had been awaiting Kahless' return for "fifteen centuries", i.e. five hundred years longer. This would also be in accord with the Sword of Kahless being dated to an age of 1,400 years in "The Sword of Kahless". Furthermore, a scene cut from "Rightful Heir" had Data specify Kahless' death as 1,547 years ago, which would place it in 822 AD.

According to TNG: "Devil's Due", the Ventaxian civilization benefited a thousand-year period of peace and prosperity. Before that period, they suffered from environmental pollution, severe overcrowding, and constant warfare. According to legend, the Ventaxians made a pact with a supernatural being named Ardra. In return, they became Ardra's slaves and had their riches given to her after those thousand years of peace. In 2367, an interstellar con artist deceived the Ventaxians into believing she was the deity in order to reclaim this prize. If the Ventaxian year is close to the Earth year, the beginning of this new era on Ventax II would be set in the 14th century.